Carrier-envelope phase stable few-cycle laser system delivering more than 100 W, 1 mJ, sub-2-cycle pulses

Two-stage multipass-cell compression of a fiber-chirpedpulse amplifier system to the few-cycle regime is presented. The output delivers a sub-2-cycle (5.8 fs), 107W average power, 1.07 mJ pulses at 100 kHz centered at 1030nm with excellent spatial beam quality (M2=1.1, Strehl ratio S=0.98), pointing stability (2.3 μrad), and superior longterm average power stability of 0.1% STD over more than 8 hours. This is combined with a carrier-envelope phase stability of 360 mrad in the frequency range from 10 Hz to 50 kHz, i.e., measured on a single-shot basis. This unique system will serve as an HR1 laser for the Extreme Light InfrastructureAttosecond Light Pulse Source research facility to enable high repetition rate isolated attosecond pulse generation.